CN107419324A - The environment-friendly liquid degreasing agent of cleaning before a kind of annealing for strip - Google Patents
The environment-friendly liquid degreasing agent of cleaning before a kind of annealing for strip Download PDFInfo
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- CN107419324A CN107419324A CN201710601567.8A CN201710601567A CN107419324A CN 107419324 A CN107419324 A CN 107419324A CN 201710601567 A CN201710601567 A CN 201710601567A CN 107419324 A CN107419324 A CN 107419324A
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- environment
- degreasing agent
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
Abstract
The invention discloses a kind of environment-friendly liquid degreasing agent of cleaning before annealing for strip, after the environment-friendly liquid degreasing agent puts on belt steel surface, the belt steel surface is adsorbed with silicon dioxide layer.Environment-friendly liquid degreasing agent of the present invention, because it is liquid-type degreasing agent, it is easy to add in process of production, consequently facilitating realizing Automated condtrol.In addition, described environmentally-friedegreasing degreasing agent does not use phosphorous assistant, harm is low to caused by environment, there is good environment friendly.
Description
Technical field
The present invention relates to a kind of a kind of degreasing agent of cleaning before degreasing agent, more particularly to annealing for strip.
Background technology
Cold-strip steel is widely used in the industries such as automobile, household electrical appliances, machinery, electronics, chemical industry, packaging for foodstuff, almost covers
Concern all trades and professions of national economy.World Iron ＆ Steel industrial development is actual to be shown, with the development of economy and society, cold-rolled products exist
Proportion in steel consumption is improving constantly, and plays more and more important effect.
, can be to strip and the contact surface of roll in order to reduce the frictional force between strip and roll during cold rolling of strip steel
Spray emulsion.In cold-rolled process, due to the presence of frictional force, have iron powder and come off from strip and roller surface.Wherein one
Part iron powder enters emulsion, pollutes emulsion, and another part iron powder then remains in belt steel surface.Meanwhile emulsion
Also can some remain in belt steel surface.These iron powders, emulsion mix, and are firmly attached to belt steel surface, structure
Into the major pollutants of belt steel surface.Annealing of the iron powder, the pollutant such as emulsion of belt steel surface attachment to rear road, coating work
Skill is harmful, has a strong impact on the surface quality of strip.
Thus, degreasing will be carried out before the anneal in cold-strip steel, to remove the pollutant on surface.
Local bonding occurs in unwinding in the cold-strip steel handled by cover annealing.Bonding is a kind of surface
Mass defect, at present worldwide using presence all different degrees of in the cold rolling mill of cover annealing.Bonding can cause
Belt steel surface is raised or tears, and reduces the lumber recovery of strip.In order to produce the cold-strip steel of high quality, many cold rolling mills are all right
Cold-rolling production process and equipment (milling train, cover annealing, smooth) are studied and optimized, to seek the method for reducing bonding.
And in the prior art, the degreasing process of strip is generally divided into immersion, spray, scrub, electrolysis, each degreasing process step
As described below：
Equipment required for soaking and washing is fairly simple, but degreasing effect is general, it is necessary to which longer degreasing time just may be used
To complete the process of degreasing；
Spray degreasing is that number row's playpipe is installed in degreasing bath, uses pressure 0.1-0.4MPa degreasing tank liquor with 45 °
Angle is ejected into belt steel surface against strip traffic direction, because the mechanical erosion of spray pressure acts on, the degreasing efficiency of spray degreasing
It is better than soak degreasing；
The iron powder that degreasing is adhered to mainly for belt steel surface is scrubbed, is scrubbed in technique, a pair of brush rolls are arranged in the both sides of strip
With support roller, by the mechanism of brush roll, the iron powder that will be attached to belt steel surface is peeled off.The degreasers such as immersion, spray, scrub
Skill can only remove the pollutant in strip plane, and the pollutant being hidden in strip microscopic void must pass through electrolytic degreasing ability
Thoroughly removed；
Strip is not directly powered in itself during electrolytic degreasing, but the electrode screen of strip is clamped by means of logical direct current
Electromagnetic induction, make strip powered and cell reaction occurs.When pole plate is anode, strip corresponding to it is then negative electrode, is at this moment existed
What is carried out on its surface is reduction reaction, and precipitation is hydrogen.When pole plate is negative electrode, then strip corresponding to it is anode, this
When carry out in its surface is oxidation reaction, precipitation is oxygen.In electrolytic degreasing, strip is immersed in degreasing tank liquor, its
The oil film on surface will crack because of reduction in surface tension.As degreasing tank liquor is strengthened the wetability of belt steel surface, take off
Fat tank liquor just produces exclusion effect to discontinuous oil film from cracks, its adhesive force to belt steel surface is weakened significantly.Together
The belt steel surface that Shi Zuowei negative electrodes, anode are alternately arranged continuously largely is emerged hydrogen and oxygen, oil film is generated again strong
Effect of impact, therefore the oil film of surface of steel plate will be torn and be dispersed into tiny oil droplet, and the hydrogen emerged from surface of steel plate
Gas, oxygen minute bubbles are easily trapped on these small oil droplets again, when bubble is gradually grown up to certain size, treat that its buoyancy is more than oil droplet
Adhesive force when, bubble just leaves surface of steel plate into degreaser with small oil droplet, and further up into tank liquor surface, reaches
To the purpose of degreasing.When a large amount of bubbles escape from belt steel surface, and electrolyte occurs strong stirring action, so that band
The greasy dirt of steel surface is emulsified strongly again, more accelerates skimming processes.
In addition, electrolytic degreasing can all be carried out on negative electrode and anode, but what negative electrode oil removing and anode oil removing were had nothing in common with each other
Feature：
(1) what is separated out on negative electrode is hydrogen, because hydrogen molecule small volume, bubble is small, quantity is more, and buoyancy is big, so it
Carrying capacity and stripping ability it is all especially strong.Simultaneously as H+Discharge process, can cause again steel plate sensing negative electrode surface
The OH of alkali lye layer-Ion concentration raises, and saponifying ability greatly improves, therefore the efficiency of negative electrode oil removing is higher.But because in the moon
Polar region always produces a large amount of hydrogen, and hydrogen molecule small volume is easy to infiltrate into inside steel plate, easily causes steel plate hydrogen embrittlement, and this is not
The physical property of base steel in itself can be only reduced, while air blister defect can be also produced in galvanizing.
(2) what is separated out on anode is oxygen, because oxygen molecule volume is big, bubble is big, quantity is few, buoyancy relative hydrogen bubble
It is small, so its carrying capacity and stripping ability are all weaker.Meanwhile the basicity in anode region is also low, so the degreasing effect of anode region
Rate is without cathodic region height.But the oxygen bubbles of anode region effusion is larger, monomer carrying capacity is strong, and it can remove surface of steel plate
The iron powder residue being relatively large in diameter, and have mitigation to steel plate base steel hydrogen embrittlement.
In view of negative electrode and anode oil removing respectively have advantage, so interlocking what is combined frequently with negative electrode and anode in electrolytic degreasing
Form completes electrolytic degreasing overall process.
Because the various techniques of strip degreasing respectively have advantage, so in the degreasing process of reality, usually soak, spray
Leaching, scrub, electrolysis are used in conjunction with, with the degreasing effect being optimal.
Publication No. CN103184461A, publication date are on July 3rd, 2013, and entitled " one kind prevents cold rolled sheet from annealing
The Chinese patent literature of the degreasing agent of adhesion " discloses a kind of degreasing agent for preventing cold rolled sheet annealing adhesion.In patent text
Offer in disclosed technical scheme, degreasing agent is made up of sodium hydroxide, sodium carbonate, sodium metasilicate etc., after degreasing agent processing
Belt steel surface can adsorb last layer silica, strip adhesion can be prevented.But the technology disclosed in the patent document
Scheme is powder degreasing agent, and powder degreasing agent has inconvenience, needs to be pre-mixed before use in use, operation scene
There is dust, have a negative impact to the health of operator.
Publication No. CN102691068A, publication date are September in 2012 26, entitled " anti-cold-reduced sheet bell furnace
Annealing is bonded with degreasing agent and its application method " Chinese patent literature disclose a kind of anti-cold-reduced sheet cover annealing and glue
Knot degreasing agent and its application method, the degreasing agent are made up of sodium hydroxide, sodium metasilicate, sodium carbonate, tertiary sodium phosphate etc., are passed through
The strip of degreasing agent cleaning, can leave a layer silicate film in belt steel surface, effectively prevent strip from carrying out bell-type annealing
When bond.But the technical scheme disclosed in the patent document is equally powder degreasing agent, exist in use it is many not
Just.At the same time, phosphate has been used to make body eutrophication as builder, the use of phosphorous degreasing agent in formula,
Polluted-water.
In the technical scheme disclosed in above-mentioned patent document, degreasing agent used by its cold-strip steel, otherwise it is powder
Degreasing agent, in-convenience in use, or being containing phosphatic degreasing agent, the harm to environment is larger.And as iron and steel enterprise gives birth to
The popularization of automation is produced, the convenient liquid degreasing agent added automatically is increasingly popularized, and the market demand of without phosphorus liquid degreasing agent is then
It is bigger.
Based on this, it is expected to obtain a kind of environment-friendly liquid degreasing agent, it uses liquid degreasing agent in favor of in production process
In be easy to add, be easy to implement Automated condtrol, and the degreasing agent does not use phosphorous assistant, harm is low to caused by environment, has
Good environment friendly.
The content of the invention
It is an object of the invention to provide a kind of environment-friendly liquid degreasing agent of cleaning before annealing for strip, it is liquid
Type degreasing agent, it is easy to add in process of production, is easy to implement Automated condtrol, and the environmentally-friedegreasing degreasing agent does not use phosphorous help
Agent, harm is low to caused by environment, there is good environment friendly.
To achieve these goals, the present invention proposes a kind of environment-friendly liquid degreasing of cleaning before annealing for strip
Agent, after the environment-friendly liquid degreasing agent puts on belt steel surface, the belt steel surface is adsorbed with silicon dioxide layer.
It should be noted that degreasing agent can be divided into two classes according to state, one kind is powder degreasing agent, and one kind is liquid in addition
Body degreasing agent.Powder degreasing agent is directly to mix the various components of degreasing agent, need during use first by powder degreasing agent first with
Desalted water premixes, then is diluted to prescribed concentration use.And liquid degreasing agent is that the various components of degreasing agent are dissolved in into desalted water
In, therefore also known as water base degreasing agent, directly diluted when it is used, without premix.Compared to powder degreasing agent, liquid degreasing agent
The convenience used is more preferably.
And in technical solutions according to the invention, it is the cleaning and degreasing before being annealed for strip using liquid degreasing agent
(such as skimming processes before strip cover annealing), that is, saponification, emulsification and the complexing of degreasing agent are played, led to
Wetting, infiltration, rolling off, scattered and solubilising mode are crossed, the grease of surface of steel plate is removed.Because：Institute in cold rolling process
The main component of ROLLING OIL is vegetable fat, and such grease is commonly referred to as the grease that can be saponified.The process of degreasing
Saponification occurs in the grease for being its alkaline constituents and surface of steel plate, generates the process of soap and glycerine.
Further, since local bonding occurs in unwinding for the strip by annealing, and in skill of the present invention
In art scheme, because belt steel surface is adsorbed with silicon dioxide layer, bonded so as to effectively reduce strip in annealing process
Probability.
Further, in environment-friendly liquid degreasing agent of the present invention, put in the environment-friendly liquid degreasing agent
After belt steel surface, the reflectivity of the belt steel surface is more than 93%.
Further, in environment-friendly liquid degreasing agent of the present invention, the percent mass proportioning of its component is：
Surplus is water and other inevitable impurity.
In environment-friendly liquid degreasing agent of the present invention, highly basic provides substantial amounts of hydroxide ion, to carry out saponification
Reaction.
In addition, in order that strip after degreasing surface attachment have silica, thus, in environmental protection of the present invention
Silicate is added in type liquid degreasing agent..In skimming processes, due to chemisorbed and the comprehensive function of silicon is electrolysed so that
Strip after degreasing surface have the attachment of silica.Before strip annealing (such as before cover annealing), band steel plate surface is managed
The silica adhesion amount thought is 1-4mg/m2.In order to reach this value, the species of silicate passes through to test and carried out in degreasing agent
Checking.The mass percent of silicate is added again by experimental verification, silicate addition is too low can not to ensure band steel plate surface
Silica adhesion amount, silicate addition is crossed can at most have a negative impact to the stability of degreasing agent.Thus, in this hair
In bright described technical scheme, the mass percent scope of silicate is controlled 5~20%.
In addition, in environment-friendly liquid degreasing agent of the present invention add chelating agent be because：Degreasing agent is when in use
Slot allocation is carried out using running water or desalted water, certain areas water quality is poor, the calcium ions and magnesium ions content overproof in water, calcium ions and magnesium ions
In the presence of the aging that can accelerate degreasing tank liquor, degreasing effect is influenceed.Therefore would generally be added in degreasing agent can be with the chelating of demineralized water
Agent.Chelating agent can be produced with the chelate of the calcium ions and magnesium ions generation solubility in water so as to avoid the presence of calcium ions and magnesium ions
Raw negative effect.
In environment-friendly liquid degreasing agent of the present invention, add solubilizer, be because：Degreasing agent product is strong basicity
System, the surfactant of sterling can not be directly dissolved in strong basicity system, only add solubilizer, just surface can be lived
Property agent solubilising enters in strong basicity system, so as to obtain the degreasing agent product of outward appearance clear.At the same time, it is of the present invention
The solubilizer used in technical scheme also lifts the stability of low modulus silicate.After strong basicity system determines, solubilizer adds
The amount direct proportionality of dosage and surfactant.
Common solubilizer includes phosphate, APG, cumene sodium sulfonate and octyl group imido grpup double propionate.One
In a little embodiments, it is to consider for solubilizer that described environment-friendly liquid degreasing agent, which uses octyl group imido grpup double propionate,
The result screened after cost of material, solubilizing effect.
In technical solutions according to the invention, surfactant is preferable emulsifying agent, can reduce of oil-water interfaces
Power, increase contact area.When strip enters degreasing process, the alkali lye that the oil film on its surface is sprayed punctures, and passes through this machine
Tool effect makes complete rupture of oil film turn into discontinuous small oil droplet, can thus make the lipophilic group of molecule in surfactant
Affinity interaction fully occurs with small oil droplet, oil is got rid of by infiltration, rolling off, scattered and solubilising.Surfactant and highly basic
Property material compounding, the saponification for playing strong alkaline substance and the emulsification of surfactant, wetting, osmosis can be integrated,
Play the effect of collaboration degreasing.Generally, surfactant only has few amount to play good effect.
It should be noted that in some embodiments, described environment-friendly liquid degreasing agent uses two kinds of surface-actives
Agent, for example with AEO and Fatty alcohol polyoxyethylene polyoxypropylene ether.Using two kinds of surfactant compounds
Use, cooperative synergism effect can be played, its using effect is better than single use a certain kind surfactant.Consider degreasing
Effect and cost of material, the mass percent of surfactant is controlled 1~10% in technical solutions according to the invention.
Further, in environment-friendly liquid degreasing agent of the present invention, the highly basic is sodium hydroxide and hydroxide
At least one of potassium.
In some embodiments, highly basic uses the good water solubility that potassium hydroxide is potassium hydroxide, is easy to rinse, residual quantity
Also it is lower.
Further, in environment-friendly liquid degreasing agent of the present invention, the silicate is sodium metasilicate, metasilicic acid
At least one of sodium and potassium silicate.
It should be noted that sodium metasilicate includes anhydrous sodium metasilicate, metasilicate pentahydrate sodium, nine water metasilicic acids in this case
Sodium.
Further, in environment-friendly liquid degreasing agent of the present invention, the chelating agent is sodium gluconate, Portugal heptan
At least one of sodium saccharate, disodium ethylene diamine tetraacetate, sodium citrate and NTA trisodium.
Further, in environment-friendly liquid degreasing agent of the present invention, the solubilizer is phosphate, alkyl sugar
At least one of glycosides, cumene sodium sulfonate and octyl group imido grpup double propionate.
Further, in environment-friendly liquid degreasing agent of the present invention, the surfactant is polyoxyethylene nonyl phenyl
Vinethene, OPEO, AEO and Fatty alcohol polyoxyethylene polyoxypropylene ether are at least within
One of.
Further, in environment-friendly liquid degreasing agent of the present invention, the surfactant is with arbitrary proportion
The AEO and Fatty alcohol polyoxyethylene polyoxypropylene ether of mixing.
Compared to prior art, environment-friendly liquid degreasing agent of the present invention has the following advantages that：
(1) environment-friendly liquid degreasing agent of the present invention does not use phosphorous assistant, small to environmental hazard, has good
Environment friendly；
(2) environment-friendly liquid degreasing agent of the present invention is because it is fluid product, thus is easy to mend in use
Add, it is easy to accomplish Automated condtrol；
(3) exist compared to prior art because the aqueous solution of the silicate of low modulus is Unstable Systems,
Crystallization is easily separated out, environment-friendly liquid degreasing agent of the present invention can be lifted due to used surfactant
The stability of the silicate of low modulus, so as to improve the stability of environment-friendly liquid degreasing agent of the present invention；
(4) environment-friendly liquid degreasing agent of the present invention rationally designs component and especially which uses a variety of surfaces work
Property agent compounding so that described environment-friendly liquid degreasing agent by surfactant with formula in other components synergy,
Realize the high efficiency of degreasing.
Embodiment
The environment-friendly liquid of cleaning before the annealing of the present invention for strip is taken off below in conjunction with specific embodiments
Fat agent makes further explanation, but the explanation and illustration does not form improper restriction to technical scheme.
Embodiment 1-10
Table 1 lists each component quality for the environment-friendly liquid degreasing agent for being used for before strip annealing cleaning in embodiment 1-10
Percentage.
Table 1. (wt%, surplus are water and other inevitable impurity)
The environment-friendly liquid degreasing agent in embodiment 1-10 is diluted into mass fraction with deionized water to use for 5%；
70 DEG C of temperature, linear speed 300mpm, Faradaic current 15A/dm2Under degreasing is carried out to strip steel plate, sample is made in the strip after degreasing
Product, measure of merit is carried out to it, and the test result of gained is listed in table 2.Wherein, method of testing comprise the following steps that it is described：
1. reflectivity test method
A) sampled at cleaning unit winding, at sampling at magnetic tape trailer 10m；
B) at strip center, belt steel surface is attached to using special 3M adhesive tapes, after tear adhesive tape, adhesive tape is bonded at A4 paper
On；
C) untapped 3M adhesive tapes are attached on same A4 paper, with the reflectivity of equipment test now, reflection now
Rate is arranged to 100, adjusting device parameter；
D) reflectivity is surveyed with the adhesive tape in the equipment testing procedure b after adjustment, record；
E) parallel testing 3 times, average as final reflectivity data；
2. silica adheres to weight testing method
A) analyzed using X-ray fluorescence spectra；
B) its principle is：X-ray tube produces incident X-rays (primary X-ray), excites sample.The sample being stimulated
In each element can radiate secondary x rays, and the secondary x rays that different elements is radiated have specific energy
Flow characteristic or wavelength characteristic.Detection system measures these energy and quantity for radiating the secondary x rays come.Then, instrument is soft
Information collected by detection system is converted into the species and content of various elements in sample by part.
Judge 3. strip bonds
A) production procedure of cold-strip steel：Cold rolling-degreasing-annealing-smooth-rewinding-packaging；
B) uncoiling state is observed at smooth uncoiling, if there is strip adhesion, streak easily occurs in plate face after uncoiling
Mark；
C) slight bonding can eliminate after smooth, and serious bonding will influence the surface state of strip, Wu Fatong
Cross smooth section of improvement.
Table 2.
As can be seen from Table 2, by each embodiment of this case environment-friendly liquid degreasing agent degreasing band steel sample, its surface
Reflectivity is more than 93%, and the silica adhesion amount of adsorption is in 2.6~3.9mg/m2,.In addition, using embodiment 1-10
The band steel sample of environment-friendly liquid degreasing agent degreasing there is not strip adhesion phenomenon, it can be seen that of the present invention
Environment-friendly liquid degreasing agent degreasing effect is good.
It should be noted that listed above is only specific embodiment of the invention, it is clear that real the invention is not restricted to more than
Example is applied, the similar change for having many therewith.If those skilled in the art directly exported from present disclosure or
All deformations associated, all should belong to protection scope of the present invention.
Claims (9)
1. the environment-friendly liquid degreasing agent of cleaning before a kind of annealing for strip, it is characterised in that taken off in the environment-friendly liquid
After fat agent puts on belt steel surface, the belt steel surface is adsorbed with silicon dioxide layer.
2. environment-friendly liquid degreasing agent as claimed in claim 1, it is characterised in that apply in the environment-friendly liquid degreasing agent
After belt steel surface, the reflectivity of the belt steel surface is more than 93%.
3. environment-friendly liquid degreasing agent as claimed in claim 1 or 2, it is characterised in that the percent mass proportioning of its component is：
Surplus is water and other inevitable impurity.
4. environment-friendly liquid degreasing agent as claimed in claim 3, it is characterised in that the highly basic is sodium hydroxide and hydroxide
At least one of potassium.
5. environment-friendly liquid degreasing agent as claimed in claim 3, it is characterised in that the silicate is sodium metasilicate, inclined silicon
At least one of sour sodium and potassium silicate.
6. environment-friendly liquid degreasing agent as claimed in claim 3, it is characterised in that the chelating agent is sodium gluconate, Portugal
At least one of heptose sodium sugar, disodium ethylene diamine tetraacetate, sodium citrate and NTA trisodium.
7. environment-friendly liquid degreasing agent as claimed in claim 3, it is characterised in that the solubilizer is phosphate, alkyl sugar
At least one of glycosides, cumene sodium sulfonate and octyl group imido grpup double propionate.
8. environment-friendly liquid degreasing agent as claimed in claim 3, it is characterised in that the surfactant is polyoxyethylene nonyl phenyl
Vinethene, OPEO, AEO and Fatty alcohol polyoxyethylene polyoxypropylene ether are at least within
One of.
9. environment-friendly liquid degreasing agent as claimed in claim 3, it is characterised in that the surfactant is with arbitrary proportion
The AEO and Fatty alcohol polyoxyethylene polyoxypropylene ether of mixing.
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| CN111618668A (en) * | 2020-06-16 | 2020-09-04 | 岳阳凯美特电子特种稀有气体有限公司 | Treatment method for inner wall of steel cylinder filled with high-purity halogen mixed gas and used polishing agent |
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Application publication date: 20171201 |